Metal-working machine.



No. 666,696. Patented 1an. 29, |9o|.

J. B. nENsHAw.

METAL wunKmG MAcHmE.

(Application led Oct. 5, 1900.)

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NITED STATES union..

METAL-WORKING NIACHIN.

SPECIFICATION forming part of Letters Patent No. 666,696, dated January29, 1901.

Application filed October 5, 1900. Serial No. 32,120. (No model.)

T0 all wwnt t may concern:

Be it known that I, JOSEPH B. RENsHAw, a citizen of the United States ofAmerica, and a resident of Hartford, in the county of Hartford and Stateof Connecticut, have invented certain new and useful Improvements inMetal-Working Machines, of which the following is a specification.

This invention relates to metal-working machines, and more especially todrilling-m achines, and has for its object the provision of a device inwhich the drill or other cuttingtool may be automatically fed into thework for a certain distance.

My invention has,furthermore,for its object the provision of meanswhereby the force which is applied against the tool may be varied orgraduated as desired and according to the various sizes of tools and toconform to the different kinds of material to be operated upon.

My invention includes as one of its features a thrust-step incooperation with the toolcarrying spindle of the device and in thecombination therewith of yielding means whereby the distance between thethrust-step andv the drill or other tool may be automatically increased.When said thrust-step is brought to rest against a fixture, the toolwill be forced into the work and in an entirely automatic manner for ashort distance and until the efiiciency of said yielding means hasceased to feed the tool.

In myimproved apparatus forming the subject of this application not onlythe strength of the means whereby the tool is fed into the work may beadjusted, as above mentioned, but, furthermore, the location of theoperating or working Zone of said means relative' to the tool-carryingspindle may be changed, so that after the tool has been fed into thework for an amount equal to'feeding limit of the yielding means thelatter may be again positioned to act on the tool for another feedingdistance.

My invention has,furthermore,for its obj ect the provision, inconnection with the operating-handle, of a device whereby the leverageof said operating-handle may be increased or decreased at will,according to the work t-o be done.

In the accompanying drawings, in which similar characters designatesimilar parts, Figure l is a central longitudinal section of my improvedapparatus, the latter being shown in its initial or starting position.Fig. 2 is a similar section representing the parts in a position afterthe cutting-tool has been fed into the work substantially to the limitof the automatic feed device. Fig. 3 is a side view of t-he apparatus.Fig. 4 is a section on an enlarged scale on line 4 4, Fig. 3.

It may be stated here that myinvention may be appliedto metal-workingmachines of various descriptions and that it is particularly adapted tomachines in which drills or similar cutting-tools are employed, suchtools being ordinarily fed into the work byhand and in such a mannerthat the drill will cut only so long as the hand-feed is continued. Ashas been stated above, it is one of the principal aims of my inventionto provide means whereby a drill or other cutting-tool may beautomatically fed toward the work for a certain distance before itbecomes necessary to employ the hand-feed to provide for another lengthof automatic feed for the device.

In the accompanying drawings my improvement is shown in connection witha ratchetdrill of ordinary construction comprising a casing l0, adaptedto receive the tool-carrying spindle l1, having peripheral teeth l1',which may be engaged by a suitable springpressed pawll2, pivoted in thehandle portion 10 of the casing 10. The spindle 1l is rotatablysupported in said casing and held against longitudinal movement thereinby a shoulder 13 on one end thereof and a nut 14E 'on its other eud.Disposed for longitudinal movement vrelative to the tool-carryingspindle 11, and preferably in screw-threaded engagement therewith,isaspindle 15, carrying at its upper end a cap 16, having a thruststep 17and adapted for sliding movement on said spindle 15. The latter ispreferably formed hollow throughout its length to support and receivethe means whereby said cap 16 may becaused to slide on the spindle 15.These means, which are preferably yielding ones, consistl in the presentinstance of a spring 18, resting with one end against said cap 16 andwith its lower end against an ad.- justable plug 19, in screw-threadedengage- IOO ment with said spindle 15, while the movement of the cap 16on said spindle 15 may be limited by a screw 20, carried by said cap andtraveling in a movement-limiting slot 21, provided in the spindle 15.The plug 19 is preferably screw-threaded to serve not only as a meansfor supporting the spring 18, but, furthermore, as a means for varyingthe efficiency of said spring, or, in other words, for increasing ordecreasing the effective working pressure thereof by turning the plug 19in proper direction. The spindle l5, which, as has above been stated, isin preferably screwthreaded engagement with the tool-carrying spindle11, constitutes a medium whereby the location of the yielding feedingmeans may be varied relative to the tool-carrying spindle, and hence itwill be understood that by rotating said spindle 15 the effectiveworking zone of the yielding feeding means relative to the tool-carryingspindle may be changed without in any way interfering with theefficiency thereof, so that said spindle 15 will practically answer thepurpose of and constitute a feed screw whereby the 'feeding means may becarried into proper working position. It will also be understood thatwhen said feed-screw 15 has been denitely located relatively to thetool-carrying spindle 11, as shown, for instance, in Fig. 1, the saidscrew will be acted against by the spring 18, and thus force the toolinto the work until the efcency of the spring has been exhausted, suchposition being shown in Fig. 2, when it again becomes necessary to turnsaid feedscrew 15J-outward.

As has been above stated, my invention also includes means whereby theleverage of the operating-handle may be increased or decreased at will,according to the work to be done, these means consisting,preferably,of a

collar 25,movably held on the operating-han- A dle 26 and securedthereto in any well-known manner. In the preferred form thereof shownsaid operating-handle is made slightly elliptical in cross-section tofit loosely within the similarly-formed aperture of a collar 25, whichlatter may he rotated on the operatinghandle until both parts are lockedfirmly together, as shown in Fig. 4. Here the collar 25 has been turnedin the direction of arrow a sufficiently to be clamped on the handle,and consequently to be held against movement thereon.

The operation of my improved device is as follows: The cutting-tool isinserted into the tool-carrying spindle 1l and the device may now beplaced in position with the point of the thrust-step 1'7 against a brace(indicated by B) and with the cutting-point of the drill against thework W. The feed-screw l5 is then turned to compress the spring 18, suchconpression being limited by the screw 20 coming in contact with thelower end of the limiting-slot 21. As the spindle 11 is now rotated inthe proper direction, the drill will gradually cut its way into the workfor an amount equal to the movement of the screw 2O in the slot 21. InFig. 2 of the drawings the parts are shown in a position when the feedmovement has taken place nearly to the limit, and the feed-screw may nowbe turned again to compress the spring sufficiently so that the lat-termay feed the drill into the Work for another feeding distance and underthe same pressure conditions as before.

Having described my invention, what l claim as new, and desire to secureby Letters Patent, is-

1. The combination, with atool-carrying spindle; of a thrust-stepmounted for longitudinal movement relative thereto; yielding means forcausing said spindle to move relatively to the thrust-step; andadjustable means for positioning the eective working zone of theyielding means relative to the tool-carrying spindle.

2. The combination, with a tool-carrying spindle; of "a thrust-stepmounted for longitudinal movement relative thereto; a spring for causingthe tool-carrying spindle to move relatively to the thrust-step; andadjustable means for positioning the effective working zone of thespring relative to the tool-carrying spindle.

3. The combination, with a tool-carrying spindle; of a thrust-stepmounted for longitudinal movement relative thereto; yielding means forcausing the tool-carrying spindle to move relatively to the thrust-step;and means for varying the eiiiciency of said yielding means.

4. The combination, with a tool-carrying spindle; of a thrust-stepmounted for longitudinal movement relative thereto; a spring for causingsaid spindle to move relatively to the thrust-step; and a device forvarying the vtension of said spring.

Aing the tension of the spring.

7. The combination, with a tool-carrying spindle; and a feed-screwmounted for longitudinal movement relative thereto; of a thrust-stepmounted for longitudinal movement relative to said feed-screw; andyielding means interposed between said step and feed-screw.

8. The combination, with a tool-carryingv spindle; and with a feed-screwlongitudinally movablerelatively thereto and carried thereby; of athrust-step carried by said screw and mounted for longitudinal movementrelative IOO IIO

thereto; and yielding means for causing the tool-carryin g spindle tomove relatively to the thrust-step.

9. The combination, with a tool-carrying spindle; and with a feed-screwlongitudinally movable relatively thereto and carried thereby; of athrust-step carried by said screw and mounted for longitudinal movementrelative thereto; yielding means for causing the tooloarrying spindle tomove relatively to the thrust-step; and adjustable means for positioningthe effective Working zone of the yield ing means.

10. The combination, with a tool-carrying spindle; and with a feed-screwlongitudinally movable relatively thereto and carried thereby; of athrust-step carried by said screw and looking the collar againstmovement thereon. 3o

JOSEPH B. RENSHAW. Witnesses:

CHAs. F. SCHMELZ, NELLIE PHOENIX.

